XtTimerCallbackProc() XtTimerCallbackProc()
Name
XtTimerCallbackProc - interface definition for procedure invoked when timeouts expire.
Synopsis
typedef void (*XtTimerCallbackProc)(XtPointer, XtIntervalId *);
XtPointer client_data; XtIntervalId *id;
Inputs
client_data
Specifies the data that was registered with this procedure.
id Specifies the ID returned when this procedure was registered.
Description
An XtTimerCallbackProc is registered in a call to XtAppAddTimeOut(), and is invoked when the specified number of milliseconds elapse. The
client_data argument is data registered with the procedure in the call to XtAppAddTimeOut(), and the id argument is the value returned by
that function.
A timer callback is called once, and then is automatically removed. If you want a callback to be called repeatedly, re-register the call-
back each time it is called,
Example
The following XtTimerCallbackProc is from the xmh program. It re-registers itself so that it will be called repeatedly. Note that it uses
its client_data argument to supply the application context so that it can re-register itself.
/*ARGSUSED*/
static void NeedToCheckScans(client_data, id)
XtPointer client_data;
XtIntervalId *id; /* unused */
{
int i;
if (!subProcessRunning) {
DEBUG("[magic toc check ...")
for (i = 0; i < numScrns; i++) {
if (scrnList[i]->toc)
TocRecheckValidity(scrnList[i]->toc);
if (scrnList[i]->msg)
TocRecheckValidity(MsgGetToc(scrnList[i]->msg));
}
DEBUG(" done]0)
}
(void) XtAppAddTimeOut((XtAppContext)client_data,
(unsigned long) app_resources.rescan_interval,
NeedToCheckScans, client_data);
}
This procedure is initially registered with the following code:
if (app_resources.rescan_interval > 0) {
app_resources.rescan_interval *= 60000;
(void) XtAppAddTimeOut(appCtx,
(unsigned long) app_resources.rescan_interval,
NeedToCheckScans, (XtPointer)appCtx);
}
See AlsoXtAppAddTimeOut(1), XtRemoveTimeOut(1).
Xt - Event Handling XtTimerCallbackProc()
Check Out this Related Man Page
XtAddTimeOut() XtAddTimeOut()
Name
XtAddTimeOut - register a procedure to be called when a specified time elapses.
Synopsis
XtIntervalId XtAddTimeOut(interval, proc, client_data)
unsigned long interval;
XtTimerCallbackProc proc;
XtPointer client_data;
Inputs
interval Specifies the time interval in milliseconds.
proc Specifies the procedure to be called when the time expires.
client_data
Specifies data to be passed to proc when it is called.
Returns
A handle of type XtIntervalId that can be used to unregister the timeout procedure with XtRemoveTimeOut().
Availability
Superseded by XtAppAddTimeOut().
Description
XtAddTimeOut() registers a procedure proc, to be called by XtAppNextEvent() with client_data after interval milliseconds elapse. The pro-
cedure is called once and automatically unregistered; it will not be called repeatedly every interval milliseconds.
Usage
XtAddTimeOut() has been superseded by XtAppAddTimeOut(), which performs the same function on a per-application context basis. XtAddTime-
Out() now calls XtAppAddTimeOut() passing the default application context created by XtInitialize(). Very few programs need multiple
application contexts, and you can continue to use XtAddTimeOut() if you initialize your application with XtInitialize(). We recommend,
however, that you use XtAppInitialize(), XtAppAddTimeOut(), and the other XtApp*() application context specific functions.
See XtAppAddTimeOut() for more information.
See AlsoXtAppAddTimeOut(1), XtAppNextEvent(1), XtRemoveTimeOut(1),
XtTimerCallbackProc(2).
Xt - Event Handling XtAddTimeOut()
Introduction
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